1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef __LIBPERF_INTERNAL_MMAP_H
 3#define __LIBPERF_INTERNAL_MMAP_H
 4
 5#include <linux/compiler.h>
 6#include <linux/refcount.h>
 7#include <linux/types.h>
 8#include <stdbool.h>
 9
10/* perf sample has 16 bits size limit */
11#define PERF_SAMPLE_MAX_SIZE (1 << 16)
12
13/**
14 * struct perf_mmap - perf's ring buffer mmap details
15 *
16 * @refcnt - e.g. code using PERF_EVENT_IOC_SET_OUTPUT to share this
17 */
18struct perf_mmap {
19	void		*base;
20	int		 mask;
21	int		 fd;
22	int		 cpu;
23	refcount_t	 refcnt;
24	u64		 prev;
25	u64		 start;
26	u64		 end;
27	bool		 overwrite;
28	u64		 flush;
29	char		 event_copy[PERF_SAMPLE_MAX_SIZE] __aligned(8);
30};
31
32#endif /* __LIBPERF_INTERNAL_MMAP_H */